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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87878dced839fa5aad5a16f77a8f83e7d929200c820cb8f228e1c1b534933958' 
  AND token = 'JG1S6VCQWH9GZkcHTKoTMkqEadv/Yn8jryl5gHZ1vfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}